Antenna for radio receiving sets



W. T. RAGLAND ANTENNA FOR RADIO RECEIVING SETS Eune 2?, 1933.

Filed Dec. 22, 1930 Patented June 27, 1933 UNITED STATES WILLIAM T. RAGLAND,

OF QHIGAGO, ILLINOIS ANTENNA FOR RADIO RECEIVING SETS Application filed December 22, 1930. Serial No. 503,883.

This invention relates to antennae for radio receiving sets and is more particularly directed toimprovements in non-directional, indoor antennae.

One object of my invention is to provide an improved, hollow, double-shell antenna adapted to be mounted on a suitable base for use either within or without a radio cabinet.

Another object is to minimize static by means of the novel construction and connection of a plurality of hollow shells to produce a better tone quality than a number of single hollow shells are capable of producing.

A further object is to provide a radio antenna having a grounding system or a counterpoise within itself.

A still further object is to increase the sensitivity of a radio receiving device to weak radio waves coming from all directions and from great distances, and to increase the sensitivity of the radio receiving set to local radio oscillations.

A still further object is to provide simple and inexpensive means for accomplishing the above and other objects.

In the drawing:

Fig. 1 is an elevational view of my 11nproved antenna;

Fig. 2 is a sectional elevational view of the same;

Fig. 3 is a plan view of the insulated coupling between the two hollow shells; and

Fig. 4 is an elevational view of a modified form of my invention showing the lead wires contacting with the outside shells of the antenna.

The same numbers are given to like parts in the various figures.

The antenna consists of two or more hollow, metallic shells preferably in the shape shown in the drawing and consisting of material having good, electrical conductivity, such as aluminum alloy or the like, one shell being placed above the other and mechanically connected by means of an insulated coupling, and electrically connected together by means of lugs having good, electrical conductivity, such as copper and the like.

Each of the two shells are built up from 50 two sections, 12 and 57, and each shell has flanges which are turned inwardly at 3 and 6 respectively to form a circumferential seam.

The insulating coupling 4 is provided with an aperture 13 to provide a passageway for the lead wire 11. The said coupling 4 further has lugs 14:, 15 and 16 having electrical con.- ductivity, such as copper and the like, which lugs contact with the lower section 2 of the top shell and with the upper section 5 of the 69 lower shell. 8 and 9 are openings in the lower shell to permit the insulated lead wires 10 and 11 'to enter into the body of the antenna. 12 is the base or stand on which the antenna is supported.

My antenna, as above described, comprises the novel consti notion of two antenna shells practically joined together and functioning as a unit for the purpose of gaining not only a greater sensitivity but also to produce a 70 better tone quality.

It will be observed that my invention comprises the new and novel feature of having a grounding or counterpoise system within itself. Inside aerials heretofore used employed a ground wire directly connected to the receiving set. My invention provides a grounding system within. itself. Even though the sections of the metallic shells of my invention, 1 and'2', and 5 and 7, are directly connected, yet by means ofthe novel arrange..- ment and connection actual tests have shown conclusively that they give a very noticeable condenser and counter'poise effect. To increase this grounding system thus found within my antenna, the ground wire 10 is not connected to the radio apparatus, but to the antenna itself. The other end of the ground wire 10, shown broken away in the drawings, is connected with a radiator or other suitable grounding means. The lead wire 11, shown broken away in the drawings, is connected to the antenna post of the radio receiving set.

It will be noted from the foregoing that, unlike antennae, which have heretofore been 9 known and used, the ground wire 10 is not connected with the radio receiving set, but directly to the antenna.

If the lower section 2 of the top shell were wholly insulated from the upper section 5 9 of the lower shell, that is, if the copper lugs 14, 15 and 16 were removed or insulated, my experience has shown me that the charge and discharge through the insulating material is noticeable on some radio sets through the sound producer or loud speaker when the antenna was indoor, but not noticeable when the antenna was outside. To overcome this noticeable effect, and at the same time to keep from grounding the antennae systems, I provide a direct connection through the insulating material, having preferably a thickness of one-eighth of an'inch,'to obtain the greatest eiiiciency. If the upper and lower metallic shells were contiguous without an intervening insulation, there would be a noticeable decrease in the sound volume. For this reason the insulating coupling 4 isprovided, as already described.

Fig. 4 shows a modified form of my antenna with the lead wires connected to the outside of the shells. My preferred form, Figs. 1 and 2, however, having the insulated wires connected to the inside of the hollow shells,

' is for ornamental purposes.

In the practical construction of my antenna,it is obvious that these lead wires might pass through a single opening rather than through the two openings or apertures 8 and 9, as shown in the drawing.

. Although I have shown the preferred form of my invention as well as one modification thereof, yet it will be understood that I do not limit myself to the drawing shown, but

' include all forms and variations of the device which do not depart from the spirit and scope ofiny invention.

Having described my invention and explained the manner ofits use, what I claim and desire to secure by Letters Patent is:

A radio antenna comprising two hollow, metallic shells, an insulated coupling member connecting said shells physically, electrical conductive lugs electrically connecting said shells, two lead wires, the end of one of said wires being connected to one of said shells and the other end of said wire connected to the antenna post of the radio receiving set, and one end of the other of said wires connected to the other shell and the other end of said wire connected to a radiator or other grounding means.

In witness whereof, I hereunto subscribe my name this 5 day of December, A. D. 1930.

WILLIAM T. RAGLAND. 

